How to check for open ports in CentOS?

You can use the following command in CentOS to check the status of open ports:

1. Use the netstat command:
2. – List all active network connections and listening ports
3. This will display all currently listening ports and their status (open or closed).
4. To utilize the nmap command: Firstly, you must install the nmap software package. Afterwards, you can use the following command to scan specific ports or ranges to see if they are open:
5. Scan the specified IP address for open ports using nmap.
6. Alternatively, you can scan the entire network range.
7. Scan a specific port on a range of IP addresses using nmap.
8. This will indicate the availability of the designated port.
9. – Utilize the firewall-cmd command (only applicable for systems using the firewalld firewall).
10. Show me a list of open ports on the firewall.
11. This will display a list of open ports in the firewall.

Please note that these commands may need to be run as root or a user with appropriate permissions.